US2993956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Error detecting system for telegraph transmission
Assignee: Western Union Telegraph Co
•
Filing: 1957-08-09
•
Granted: 1961-07-25
•
Expires: 1977-08-09
Abstract
No abstract record available.
Inventors
- 👤 Steeneck Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:21
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/004; H04L1/0056; H04L1/0061
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1972326A
Cited
US2242196A
Cited
US2281745A
Cited
US2653996A
Cited
US2596199A
Cited
US2689950A
Cited
US2850718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |